Band-saw machine.



M. E. SHINN.

BAND SAW MACHINE. APPLICATION HLED nzms lssa.

Patented Apr. 30, 1918.-

4 SHEETS-:SHEET I.

III]

M. E. SHINN.'

BAND SAW MACHINE. APPLICATION FILED nc.15, 1913.

Patented Apr. 30, 1918.

. 4-SHEETS-SHEET 2Q 4 M. E. SHINN. BAND SAW MACHINE.

APPLICATION FILED DEC-15 1913- I 1,264,339., Patented Apr. 30, 1918.

4 SHEETS-SHEET 3.

I k 1 \v M. E. SHINN.

BAND SAW MACHINE. APPLICATION FILED DEC. 15, I9|3- Patented Apr. 30,.1918.

4 SHEETS-SHEET 4.

MARTIN E. snnvn, or (intense, rnnnvors.

BAND-SAW MACHINE.

Specification of Letters Patent.

Patented Apr. 30, MM.

Application filed December 15, 1913. Serial No. 806,724.

To all whom it may concern:

Be it known that I, MARTIN E. SHINN, a citizen of the United States, andresident of Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Band-Saw Machines, ofwhich the following is a full, clear, and exact specification.

This invention relates to improvements in band saw machines in whichheretofore the supporting and driving pulleys direct the endless bladein parallel lines between them, and thereby limit the length of piece tobe cut from a strip to that corresponding with the diameter of saidwheels.

This invention also relates to improvements in band saw machines inwhich the path of travel of the band saw is permanently fixed, and thematerial to be sawed is pushed over a fixed table, and in some instancesupon a table movable toward and from the cutting portion of the sawblade.

The prime object of my invention broadly stated is a band saw machine inwhich there is no limit to the length of piece and pieces that may besevered from a strip and strips of unlimited length and endless stripsif need be.

A further object of my invention is aband saw machine of a constructionmaking it possible and practical for the saw to sever from a strip onlines both at a right angle or obliquely thereto, and in oppositedirections,

pieces limited in length only by the length of strip from which they aresevered and from strips of unlimited length.

Another object of my invention is a band saw machine, the endless sawblade of which is movable back and forth toward the material. to beoperated upon when supported upon fixed table, and which if desired mayalso be concurrently movable toward and from a movable endless sawblade.

Another object of my invention is a band saw machine in which thesupporting frame for the band saw may be tilted without substantiallydiverting the cutting portion of an endless saw blade from a verticallypoised position.

A further object of my invention is a band saw machine the drivingmechanism of which. is actuated by means of a flexible drive shafthaving a fixed bearing at one end in the frame of the 'machine, whichshaft is so constructed that its length is extended and shortened as themovable carriage supporting the band saw is moved back and forth towardthe work being operated upon, and whereby a single shaft of simpleconstruction is provided for driving the band saw actuating drivingmechanism.

A still further object of my invention is to adjustably limit theforward movement of the cutting portion of the saw blade in such amanner that the saw blade will cease to operate on reaching that limit.

A still further object of my invention is a clamp for sustaining thework in its operative position to the saw, the jaw of which forsupporting the material to be out at differing angles relative to thedirection of cut of the saw blade, is sustained at its end adjacent thesaw blade against a fixed bearing on which said jaw has a shiftingmovement maintaining the adjacent end portion of the jaw throughout itsadjustment in a fixed relative position to the saw blade.

With these ends in view, my invention finds embodiment in certainfeatures of novelty in the construction, combination and arrangement ofparts by which the said objects and certain other objects arehereinafter attained, all as fully described with reference to theaccompanying drawings, and more particularly pointed out in the claims.

In said drawings:

Figure 1 illustrates a side elevation of a band saw machine in which myinvention finds embodiment.

Fig. 2 is an end elevation thereof.

Fig. 2 is a detail cross section through the saw carriage trackway andrack bar.

Fig. 3 is a detail section showing the construction of the support andadjusting device for the saw carriage.

Fig. 1- is a top plan view.

Fig. 5 is a transverse section on the line of Fig. t looking in thedirection of the arrows. V

Fig. 6 (Sheet 1) is a detail transverse section on the line 66 of Fig. 7looking in the direction of the arrows.

Fig. 7 is a detail section longitudinally of the shaft for tilting thesaw carriage.

Fig. 8 (Sheet 3) is a transverse section through the coupling of thedrive shaft on the line 88 of Fig. l.

Fig. 9 is a detail longitudinal section of the drive shaft coupling, i

a an

Fig. 10 illustrates diagrammatically a: modification of the arrangementof the pulley supports for the saw blade.

Fig. 11 illustrates a still further modification of the arrangement ofthe pulley supporting the saw blade.

Fig. 12 (Sheet 4) is an enlarged detail section of a modified form ofsaw guide taken on the line 12 of Fig. 1%, looking in the direction ofthe arrow.

Fig. 13 is an enlarged detail longitudinal section through one of thetwo universal joints of the drive shaft of the machine.

Fig. 1a is a side elevation of the modified form of saw guides of Fig.12.

Fig. 1-5 is a front elevation of the same.

Fig. 16 is a front end view of the modified saw guide showing theposition of the band a saw therein, and

Fig. 17 is a section of the same taken on the line 17 of Fig. 12.

Similar characters of reference indicate the same parts in the severalfigures of the drawing.

The fixed frame of the machine may be of any nitable construction, asfor example, opposing side frames, each of which consists of base bars18, spaced upright bars 19 and 20 toward the front end of the machine,and top bar 21, the lower portion of the upright bar 20 curving towardthe rear end of the machine at which latter point the base supports anobliquely projecting bar 22.

These base bars are preferably provided with slotted lugs 2323 forretaining bolts, not shown, securing the machine to a floor, or othersuitable foundation.

Supported on the upper ends of these side frames and secured to theuprights 19 and 20 by bolts 2 l24 is a work-table 25 provided at itsfront edge with a depending flange 26, and toward its rear edge with asimilar and parallel flange 27, in which flanges the bolts are secured.

Cast with, or otherwise secured to the underside of the table andprojecting rearwardly thereof is a plate 28, from which projects an arm29 provided with a slot 30 registering with a similarly curved slot 31in the table 25.

Rigidly secured to the plate 28 is the fixed jaw 32, in which the stripsto be sawed while supported by the table are held by the movable jaw 33in the path of the saw blade, hereinafter described, the movable awbeingadjusted for this purpose by means of a screw bolt 3-1 on which is apawl 35, engaging a rack bar 86 forming (see Fig. 1) the bottom of agroove 37 in the work-table, serving as a guidefor the movable jaw 33,which is adjusted by means of a lever-38 0n the end of thescrew-threaded bolt 3 1.

Any other construction of movablej aw and the'means for adjustin'gitmay, however, be employed.

The front side of the fixed aw 32 is provided with a vertical groove 39struck on the are of a circle, and forming a bearing for thecorrespondingly convexed end 10 of a gage plate -11, and whereby a stripmay be so held that it may be severed at predetermined diil ering anglestransversely thereof by the band saw of the machine.

Following the swinging of the gage plate upon its socket joint with thefixed jaw 32 of the clamp, and then loching the gage plate to the arm2?) or the table 25, as may be, by means of a bolt and nut 12, the beltof which works in the segmental groove 30 or 31 as may be.

It will now be observed that the arc of the circle upon which the jointbetween the gage plate and the fixed jaw is formed is such that althoughthe gage plate comes up close to, and its curved end portion l0 forms aportion of the slot 13, the adjacent end of the gage plate can neverproject in the path of the saw, or in other words the gage plate moveson the arc of a circle, the axis of which is at the adjacent end of theslot 13, and therefore at whatever angle the gage plate may be swung itcan never be moved across the path of movement of the saw blade,especially during its bachward movement past the gage plate ashereinafter described.

dournaled in bosses it (see Fig. 5) in the ass bars 18 of the frame is arock shaft 15, secured to which shaft are blocks -16 upon which aremounted at each side of the machine channel bars 17 forming thetrackr-cay and a rocking support for the band saw carriage.

The band saw carriage may be of any construction suitable for thepurpose, but which as shown in the drawings consists (see Fig. 5) of across bar 18 from which extends toward the front of the maehine sidebars 4.9, which cross bar forms a support for an upright frameconsisting of posts 50 and 51, one of which, 50, is at the extreme sideof the carriage, and the other 51, inwardly removed from the oppositeside, which bars curve forwardly at their upper ends, wl'ierc they areconnected by an angular cross bar 52, which projects some distanceoutwardly beyond the post 51, the posts 50 and 51 being furtherconnected about mid-way their length by a cross at its opposite endswith rollers 57 supported by the bottom bars i7.

Secured to the axle 56 by a set screw 56 is a mutilated pinion 58meshing with a vertical rack bar 59 fixed in any suitable flange of theside way to the side bar 49, and oscillated by means of a hand screw 60working in a plate 61, secured by bolts 62 to the bar 48 of thecarriage, and to which end the hand screw is socketed in a loose collar63 on the axle 56, and whereby the rear ends of hand lever 69 foroscillating the mutilated pinion 66 to raise and lower the channel bars;

Hand lever 69 (see Fig. 7) is secured to the shaft by a pin 70, andhaving a larger bore than the diameter of the shaft may be rockedthereon for engaging'it with a segmental rack 71, a spring 72 on theouter end of the shaft 68 and bearing against the upper end of the handlever 69 serves to hold the hand lever against accidental disengagementfrom the rack.

With the channel. bars supported on the rock shaft (see Fig. 8) and inthe position shown in Fig. 3 the front ends of the tracks 47 are atabout the limit of their upward stroke, and therefore about level, butit will be seen that by pushing the hand lever to the left in 8 theforward end of the track will be tilted downwardly on the rock shaft.and the rear end] of the tracks accordingly elevated, and the sawcarriage correspondingly rundown hill on its tracks, whereby both thegravity and momentum of the carriage are utilized for forcing the bandsaw through the strips to be severed.

In suitable bearings in the forward end of the side bars as of thecarriage (see Figs. 1, 2, 3 and 5) is an aXle 73 at the opposite ends ofwhich are rollers 74L, which like the rollers 57 travel upon a track wayformed by the flange of the side bar 17, and thereby furnish a supportfor the for ward end of the carriage.

Secured to the flange of the channel bars at each side of the machine bymeans of rivets or bolts 75 is a rack bar 76 with which mesh pinions 77on the shaft 73, thereby directing the carriage in a straight line andpreventing one side from moving faster or slower than the other, thelateral oscillation of the carriage being further prevented by ahorizontal roller 78 on a lug 79 projecting from one of the side bars 49of the carriage,

With the carriage supported by the rollers 57 and 74 as above described,and in the horizontal position shown in Figs. 2, 3 and 5, it will now beseen that'on moving the hand lever 69 inwardly toward the machine, thefront end of the track way will be tilted downwardly, and the rear endupwardly accordingly, with the result that the cutting edge of the sawblade 80 will be accordingly tilted forward, which is objectionable whena vertical cut is to be made.

The saw blade, however, may be moved toward a vertical position byforcing the axle 56 downwardly by means of the hand screw 60, the effectof which will be to rotate the mutilated pinions 58, and by theirengagement with the rack bars 59 operate to lower the rear end of thesaw carriage, and

correspondingly tilt the saw blade, which blade may however thereafterbe adjusted until the saw is again brought to a vertical line withoutdisturbing the inclined position of its track-way.

The devices above described not only serve to utilize the gravity of thecarriage for moving the saw toward its work, but to adjust the saw bladeto make a cut at any desired angle in the work, and in this connectionit is proper to observe that for these purposes the rock shaft 4&5 and16 is preferably located at midway the length of the track-way, as shownin the drawings.

The cutting portion of band saw 80 is supported at its top by a pulley81 on a pintle 82, secured to a lug 88, at the top of the overhangingframe, on which pintle the pulley 81 is loose and secured in itsoperative position by means of collars 84 and 85 at opposite sidesthereof tightened upon the pintle by set screws 8686, the collar 84having secured thereto a handle 87 by means of which the operatorcontrols the backward and forward movement of the band saw, and itssupporting devices.

The lower end of the cutting edge of the band saw is supported on apulley 88 on a pintle 89 in a lug 9O projecting from one of the sidebars 49.

The pulley 88 is directly below the pulley 81 with the result that thefront or cutting portion of the band saw travels on a line parallel tothat of a line passing through the axes of the two pulleys, from whichpulleys the upper portion of the band saw is directed to and over apulley 91, and from the pulley 88 rearwardly to a pulley 92 on a pintle93 in a hub 94 projecting from the side bar 49 of the carriage.

It will now be observed that the axes of the pulleys 91 and 92 convergetoward the end of the carriage; and that in operation the band sawpasses in an inclined upward direction from the pulley 91 over thepulley 81, thence downwardly underneath the pulley 88, and in aninclined upward direction over pulley 92 to a pulley 95 at the rear of:the machine, the axis of which pulley 95- is at a right angle to that ofthe pulleys 81- and 88.

The. arrangement of these several band saw supporting pulleys at therear of the pulleys 81 and 88 and in the relation thereto and to eachother as herein shown and described, is such that in diverting thecutting edge out of line with other portions of a band saw, thenecessary torsion or twist in the blade is so distributed and slightthat in its operation the blade is not retarded,

and that no. part of it is subjected to a torsional strain tending tofracture it, even when runningat its highest rate of speed.

Projecting fronrthe curved post 51 is a bracket 96 to which .is bolted,or otherwise secured, a blade 97, the top edge of which forms atrack-way for a sliding plate 98, on

which isa lug 99 supporting a pintle 100,

on which-thepulley and gear wheel 103 are sleeved, and held againstlateral dis placement by a collar 101 and set screw 102. lVorking in thepost 51 and bearing against the lug 99 is a hand screw 104 whereby thepulley 95 is adjustable for taking up slack in the band saw.

Meshingwith the gear wheel 103 is a pinion 105' on a sectional driveshaft 106 driven loya belt pulley 107, and to which end said pulley issecured to the section 108 of the shaft, the fixed bearing of which is ahub l09,'projecting'from the side bar 22 of the frame.

112 is-ra shaft section 114 by means of a screw 115, the ends of whichshaft sections and 114 are spaced apart as indicated at 116 (see Fig. 9)to form a take up for the shaft 110, lengthened and shortened as it iswith reference" to the fixed bearings of the shaft as'hereina'fterdescribed.

The opposite end of the shaft 114 is connected'with a' shaft section 106before described, and onwhich is the pinion 105, by means of a toggle114*.

The shaft section 106 has its bearing in a hub1'17 suspended by an arm118 dependlng from the sliding plate 98 supporting the gear-wheel 103.

'Itwill now be observed that the balls 113, see F 1g. 8 severallyproject into pockets in theshaft 110 and into grooves 1n opposition toeach other in the sleeve 112, and serve not only as anti-frictiondevlcesfor the shaft section'110 in its longitudinal movement, but

at the same-time-operate to' lock the shaft to the hub, whereby therevolutions of the shaft section 110 are imparted to the shaft section114.

The reciprocations of the shaft section 110 in the sleeve 112 providefor the longitudinal expansion and contraction as a whole of the shaft106, as for example, when the saw carriage is advanced from the positionshown in Fig. 4 the shaft section 110 recedes from the section 114 andvice versa, as the carriage is moved toward the limit of its backstroke, and as the result of which a single shaft having a fixed bearingat both of its ends is successfully employed as the drive shaft for aband saw mounted upon a movable carriage and driven by a positive gearconnection.

For obtaining the best results in band saw machines for the severing ofmetal bars and the like, and for which the construction of machinesshown and described herein is intended and particularly adapted, the sawblade must be as rigidly sustained against both a backward and lateralmovement at points below and above and as nearly adjacent to the metalto be severed, and with the least possible friction, and to these endsmy invention includes a saw guide, the support for the back edge of thesaw of which moves with a saw blade confined against lateral movement byrollers at opposite sides of the blade.

In Figs. 1, 2 and 5 is shown an upper saw guide by which these resultsare secured in which a lug 119 by means of a screw 120 is verticallyadjustable 011 a bar 121, suspended from a lug 122 in which it isadjustable by means of a thumb screw 123, and may be locked by a screw124. Projecting laterally from the lug 119 is a flange 125, supporting aplate 126 pivoted to the flange 125 by a pivot 127, the plate 126 beingprovided with an enlargement 128 forming a track way for a block 129vertically adjustable by a set screw 130 passing through :1. lug 131projecting from the block and impinging against the enlargement 128 ofthe plate 126.

Pivoted to and projecting from the head block 129 are rollers 132 and133, and. screwed to the block (see Fig. 12) for example, is a hub 134011 which are sleeved disks 135 and 136 between which in grooves towardtheir periphery are confined antifriction balls 137, the sleeved disksbeing held in their operative position on the hub by means of a hubflange 138, and a washer 139 secured in its operative position by meansofa set screw 140 and washer plate 141.

The disks 135 and 136 toward their peripheries span the space betweenthe rollers 132-and 133 so that the disk adjacent to the rollers affordsa movable bearing and back stop for the backedge of the saw at a pointso near the periphery of the disk that being sleeved on the hub andtogether withits antifriction bearings reduces to a minimum frictionbetween a saw blade and its back stop, while in the meantime the rollers132 and 133 revolving freely on their axes as they do confines the sawblade against lateral movement.

In Figs. 14 to 17 inclusive are shown a modification of the upper sawguide and the means by which it is suspended by the bar 121, and towhich end the hub for the disks 135 and 136 is provided with a screwthreaded end passing through the upright memher 142 of an angle plate143 mounted upon a pivot 157 secured to an arm 145, the opposite end ofwhich is provided with an elongated slot 146 through which passes ascrew 147 passing into and securing the arm against the end of the bar121, the lateral guide rollers 148 and 149 between which the sawprojects and against the disk 136 being likewise secured to the uprightmember 142 by means of screw bolts 150 secured in their operativepositions by nuts 151 and passing through loose hubs 152152 spacing therollers 148 and 149 from the upright member 142.

Passing through a lug 153 of the plate 143 is a thumb screw 154, thescrew-threaded end 155 of which works in the arm 145.

The inner side of the lug bears against a flange 156 on the screw sothat as the screw is moved toward and from the arm 145, the plate 143 isswung upon its pivot 157, and the saw guides and supports thereby swunghorizontally on the arc of a circle for the accurate and closeadjustment of its rollers and disks to the saw blade, respectivelypassing between and bearing against them.

Below the work table is a saw guide 156 mounted upon a pivot 156supported by a post 156, which as shown is of the usual constructioncommonly employed as the lower guide for band saws, but which inpractice I prefer to be of the construction in Fig. 14 hereinbeforedescribed.

It would however, not be a substantial departure from other importantfeatures of my invention to use other forms and constructions of sawguides although I regard that of the modification which is described, asnot only cheap of construction, convenient of adjustment, but eflicientin operation.

Moreover my invention is not limited to the hereinbefore specifiedarrangement of the pulleys by which the non-operating portions of a bandsaw are deflected laterally at an angle to the vertical path or line oftravel of the operating portion thereof, and this whether a band saw ismounted upon a reciprocating carriage, a pivoted support, or a fixedsupport.

For example, in Fig. 10 is diagrammatically illustrated a horizontallyU-shaped frame 158 at the free ends of which are pivoted pulleys 159 and160, between which the operating portion 161 is conducted and thencedeflected rearwardly over upper and lower pulleys 162 and 163 pivoted toarms 164164 and thence rearwardly thereof over a quite large pulley 165pivoted to an arm 166 projecting from and forming a part of the frame158, which frame may be fixed to a base 167 as may be desired.

It will now be observed that in Fig. 10 the axes of the pulleys 162,163, are at a right angle to the axes of the pulleys 159 and 160 betweenwhich the operating portion of the saw blade is extended and that thesaw blade is conducted from these last named pulleys obliquely theretoand thence in a direct line to the pulley 165 instead of on anglesconverging from the forward pulleys to the rear pulley as in Fig. 1.

In the still further modification illus trated in Fig. 5 the operatingportion of the saw blade 161 passes, as indicated by the arrow from andto pulleys 168 and 169 thence over a pulley 170 around a pulley 171 andforwardly underneath a pulley 172 to the pulley 168, but that inarrangement the three rearward pulleys in Fig. 11 differ from theiraxial position from the corresponding pulleys in that their several axesare parallel to each other, and at a right angle to the axes of theforward pulleys supporting the operating portion of a band saw, whereasin Figs. 1 and 10 the axes of all the rear pulleys are at either a rightangle or an oblique angle to the axes of the front pulleys.

These several arrangements of supports being for a band saw by whichthere is no limit to the length of strip that may be severed from astrip without limit in length, or which is continuous, it will now be observed that the arrangement of the band saw supporting pulleys in everyinstance is such that only a quarter turn is taken and at but fourpoints in the saw blade and'at such intervals thereof that the blade isnot subjected to a strain tending to fracture or break it, that it maybe run at its highest speed with the least possible resistanoe fromfriction with its supports, and that I am able to accomplish thisimportant result by the employment of not more than five band sawsupporting pulleys in arrangements severally differing from each other.C

' My invention inthis respect, however, is not limited to any of thearrangements of pulleys herein shown and described, but includes anymeans by which a band saw may be supported and operated in any manner bywhich it is possible and practical to direct the operating portionthereof either vertically or at an oblique angle,

with reference tothe plane of the material being operated upon, and atthe same time so deflect or divert other portions of a band saw awayfrom the operating portion thereof at such an angle with reference tothe path traveled by the operating portion of the blade, that no otherportion thereof shall be an obstruction restricting the length of pieceto be severed from a strip of unlimited length.

At this point is should be observed that the length of the work tableand its relative position to the saw is such that it is adapted forsupporting in its operative position for being severed a strip ofindefinite length, and also in this position for a cut therethrough ofan angle not less than forty-five degrees; that the depth of a rightangle cut is limited only by the fixed member of a clamping aw, whichmay be adjusted to any point rearwardly of that at whichitis shown to belocated in the drawings, limited only by the length of stroke of the sawcarriage and the longitudinal extensibility of the driving shaft for thesaw actuating mechanism.

In other words it is possible with my invention by extending the lengthof movement of the parts above referred to, to correspondingly extendthe length of movement of the cutting portion of the saw, and the widthof the material that may be completely severed.

So far as I am aware I am not only the first to disclose any means bywhich it is possible and practical to divert from the operating portionof a band saw other portions in paths none of which are parallel to thatof the operating portion, but also the firstto support a band saw in itsoperative position by means of a reciprocadving carriage bodily, and bymeans of its gravity move and feed the saw against the material to be'severled, or in which a band saw fed by gravity to the work is operatedby means of a single drive shaft.

I-laving described my invention, what I claim, and desire to 1 secure byLetters Patent is:

L A device for the purpose described comp'nsing in combination a table,a band saw, a driving pulley and supporting pulleys therefor adapted todirect the operating portion of the saw along a path of movementperpendicular to the supporting surface of the table, and other pulleysdirecting portions of the saw along paths, not parallel with the path ofthe operating portion of the saw.

2A .device for the purpose described comprising. in combination a table,a band saw, a driving and a number of supporting pulleys thereforadapted to direct the operating portion of the saw along a path ofmovement perpendicular to the supporting surface of the table, and allother portions along paths no one of which intersects a lineperpendicular to the path of n'iovement of the operating portion of thesaw.

3. A device for the purpose described comprising in combination a table,a band saw, driving and supporting pulleys therefor adapted to directthe operating portion of the saw along a path of ll'lOVQlllOlli)perpendicular to the supporting surface of the table, no one of whichother portions is parallel to or intersected by a line perpendicular tothe operating portion of the saw.

4%. A device for the purpose described comprising in combination atable, a band saw, a driving pulley and supporting pulleys so arrangedthat the cutting portion of the blade is moved in a path perpendicularto the plane occupied by said table, and that the remaining portion ofthe blade moves in both straight and curved paths, no one of which isparallel to or intersects the path of the operating portion of the saw.

5.1L band saw machine comprising in combination a band saw, pulleyssupporting and directing the cutting portion of said blade, the axes ofwhich pulleys are on lines perpendicular to a horizontal plane, adriving pulley, the axis of which extends at a right angle to saidpulleys, and further pulleys, the line of the axes of which are at anoblique angle to the several before mentioned pulleys.

6. A band saw machine comprising in combination a band saw, supportingpulleys for the cutting portion of the blade thereof, the axes of whichpulleys are par allel and extend on lines pcrpein'lirailal. to a linepassing therethrough, a driving pulley the axis of which is on a line ata right angle to said. pulleys, and other support ing pulleysintermediate the driving pullcy, and said supporting pulleys, the axesof which other pulleys are on lines extending at oblique angles to saidfirst mentioned three pulleys.

7. A band saw machine comprising in combination a band saw, a drivingpulley and supporting pulleys therefor directing the operating portionof the blade along a line perpendicular to a horizontal plane, and otherpulleys directing the remaining portions of the blade away therefromalong arcs of circles, and also on lines extending 1.20

obliquely to a horizontal plane.

8. A band saw machine comprising in combination a band saw, supportingpulleys between which the operating portion of the blade is conducted inavertical line,

a driving pulley, and other supporting pulleys intermediate saidfirst-named supporting pulleys, the arrangement of which said severalpulleys is such that the teeth of the operating portion of the bladeoppose Leeaeae the material to be sawed on a line perpendicular thereto,and that the remaining portions of the blade have a differing path oftravel therefrom and from each other along lines projecting rearwardlyof the material to be sawed, whereby pieces of indefinite length ofsubstantial width may be sawed from strips of unlimited length, and fromcontinuous lengths.

9. A band saw machine comprising in combination a band saw, driving andsupporting pulleys therefor, supporting and conducting the cuttingportion thereof along a line perpendicular to a horizontal plane, andthe remaining portions rearwardly therefrom in differing planes, andagainst possible contact with a strip of unlimited length to be severedthereby, a tilting carriage and a flexible drive shaft connecting saidcarriage and pulleys.

10. A band saw machine comprising in combination a band saw, a drivingpulley therefor, opposing pulleys suspending said band saw, supportingpulleys intermediate thereof and the driving pulley, a belt drivenpulley, a sectional drive shaft, for connecting the belt and drivingpulleys, universal joints, and an intermediate extensible joint in saiddriving shaft whereby a band saw having a bodily reciprocating movementmay be oper ated from a single drive shaft.

11. A band saw machine comprising in combination a band saw, driving andsupporting pulleys therefor, a reciprocating carriage supporting saidpulleys, and band saw, a sectional drive shaft actuating said drivingpulley, provided with bearings respectively fixed in the frame of themachine and said carriage, an extensible sleeve, and universal joints insaid shaft at points intermediate said fixed bearings, whereby the sawis continuously operated by a single drive shaft, and throughout thereciprocations of the saw carriage.

19 A band saw machine comprising in combination a band saw, means foroperating the same, a reciprocating carriage supporting said band saw,and means for tilting said carriage.

13. A band saw machine comprising in combination a band saw, supportingpulleys and operating mechanism therefor, a reciprocating carriage uponwhich said saw, pulleys and mechanism are supported, means for tiltingsaid carriage, whereby the saw is inclined and movable by the gravity ofthe carriage down an incline to, and is fed to its work, and meanswhereby the operating portion of the saw may be moved from an inclinedto a vertical position and the angle of the saw cut accordingly varied.

14. A band saw machine comprising in combination a band saw, separatedsupporting pulleys therefor, means for adjusting said pulleys andtherewith the cutting porion of the saw toward and from a vertical linepassing through the axes of said pulleys rearwardly thereof, the axes ofwhich are permanently on lines oblique with reference to a horizontalplane, and to each other, and a driving pulley, the axis of which is ona fixed horizontal line, whereby a band saw may be operated, supportedby and conducted over said several pulleys with but a quarter twist attwo points in the nonoperatin portions thereof, and said nonoperatingportions be conducted rearwardly of a line passing transversely throughthe operating portion of the saw blade, and to the direction of the cutproduced by its teeth.

15. A band saw machine comprising in combination a fixed frame, areciprocating saw carriage supported by said frame, a band saw, drivingand supporting pulleys therefor, a driving gear and a pinion thereforjournaled in said frame, a single drive shaft, one end ofwhich isjournaled in said frame and the other in said carriage provided withuniversal joints, and an intermediate extensible joint.

16. A band saw machine comprising in combination a fixed frame, areciprocating saw carriage, a band saw mounted thereon, a tracksupporting said carriage mounted upon. the fixed frame, and means foradjustably varying the cutting pressure of the saw.

17. A band saw machine comprising in combination a fixed frame, areciprocating saw carriage, a band saw supported by said carriage, atrack way secured to said frame for and supporting said carriage, andmeans for tilting said track for actuating the carriage by gravity in aforward direction.

18. A band saw machine comprising in combination a reciprocating sawcarriage, a band saw mounted thereon, a fixed frame,

a track pivoted to and fulcrumed on said frame, and means whereby thetrack is tilted, whereby the gravity of the carriage and saw areutilized for automatically feeding thesaw to its work.

19. A band saw machine comprising in combination a reciprocating sawcarriage,

a band saw mounted and operated thereon, a fixed frame, a track supportfor the carriage fulcrumed thereon, means for tilting said track, andthereby feeding the saw to its work by the gravity of the carriagemoving down an incline plane, and means connecting said track andcarriage for adjusting the operating portion of the saw toward and froma vertical line therethrough.

20. A band saw machine comprising in combination a fixed frame, a trackat each'125 side thereof fulcrumed on said frame, a hand lever formoving said track on its fulcrum, a saw carriage supported by saidtrack, means connecting the opposite end portion of said track with saidsaw carriage for-raising and lowering the rear end thereof, a band sawand driving and supporting pulleys mounted upon said carriage.

21. A band saw machine comprising in combination, a fixed frame, a trackfulcrumed on said frame, means for tilting said track downwardly at itsforward end, a saw carriage provided toward its forward end. with ashifting fulcrum on said track, a band saw, driving and supportingpulleys journaled-in said carriage supportin said saw, and meansconnecting the rear end of said carriage with its supporting track, andwhereby the carriage may be tilted on its shifting fulcrum and the sawaccordingly moved toward and from avertical line therethrough;

22. A band saw machine comprising in combination a track, a fulcrumtherefor in termediate its ends on which to tilt said track, a rack baron the forward end thereof, a pinion meshing with said rack bar, a handlever for actuating said track on its fulcrum, a reciprocating sawcarriage fulcrruned at its forward end on said track, means toward therear end of said track for adjusting the saw carriage to a tiltedposition of the track, a band saw, driving. and supporting pulleystherefor provided with journals secured to said carriage whereby ontilting the track and the saw to an inclined position the operatingportion of the saw may thereupon be re-adjusted to a vertical linepassing therethrough.

23. A band saw machine comprising in combination a reciprocating sawcarriage, a band saw, driving and supporting pulleys therefor mounted onsaid carriage, a fixed jaw, a gage plate, and a pivot hearing betweenand connecting one end of said gage plate with said jaw, whereby thegage plate may be adjusted on lines radial to the point of the entrancecut of the saw, and the strip to be sawed may be supported at differentangles relative to the direction of cut of the saw. 7

2A. A band saw machine comprising in combination a Work table, fixed andmovable clamping jaws therefor, respectively secured to and mounted uponthe work table, a gage plate, a knuckle joint between and connecting oneend of said gage plate with the fixed clamping .jaw whereby said gageplate and the work may be adjusted to differing angles with reference tothe direction of a saw, and means for locking said gage plate in itsadjusted position.

25. A band saw machine comprising in combination a band saw, astationary work table, a clamping jaw fixed to said table, a movable jawtherefor nioinited thereon, a gage plate, a socket like connectionbetween one end of said gage plate and the fixed jaw whereby the gageplate may be swung upon lines tangent to a circle, the axis of which isthat of the movable jaw.

26. A band saw machine comprising in combination a band saw, driving andsupporting pulleys therefor, and a swinging guide for said saw, thebearing face of which guide is rotated by the Contact of the sawtherewith.

27. A band saw machine comprising in combination a band saw, a pivotedguide therefor, comprising rollers preventing a lateral movement of thesaw, one of which rollers forms a bearing for the back edge of the sawblade, all of which rollers are rotated by the direct contact of theblade therewith.

28. A band saw machine comprising in combination a band saw, a saw guidecomprising rollers, the arrangement of which prevents a lateral movementof the saw blade passing between them, a rotatable disk against whichthe back edge of the sau blade has a bearing, and is rotated by themovement of the saw and anti-friction rollers upon which said disk ismounted.

In witness whereof, I have hereunto set my hand and aflixed my seal this10th day of December, A. D. 1913.

MARTIN E. SHINN.

Witnesses:

MILDRED ELsNnR, JNo. G. ELLIOTT.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of I'atents,

Washington, D. G.

